import React, { Component } from 'react'
import {nanoid} from 'nanoid'
import './index.css'

export default class Header extends Component {
  handleKeyUp = (event) => {
    const { keyCode, target } = event
    let id = nanoid()
    if (keyCode !== 13) return
    if (target.value.trim() === '') {
      alert('输入不能为空')
      return
    }
    let obj = {
      id: id,
      text: target.value,
      done: false
    }
    this.props.addTodo(obj)
    target.value = ''
  }
  render() {
    return (
      <div className="todo-header">
        <input onKeyUp={this.handleKeyUp} type="text" placeholder="请输入你的任务名称，按回车键确认"/>
      </div>
    )
  }
}
